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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ReadOnlyProperty.html 926 2014-09-17 03:05:56Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.vaadin7;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.vaadin.data.Property;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.EventObject;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>/**<a name="line.14"></a>
<span class="sourceLineNo">015</span> * Support superclass for {@link Property}s with read-only values.<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Provides a somewhat more space-efficient implementation than Vaadin's {@link com.vaadin.data.util.AbstractProperty},<a name="line.16"></a>
<span class="sourceLineNo">017</span> * which is useful when there are many instances in memory.<a name="line.17"></a>
<span class="sourceLineNo">018</span> *<a name="line.18"></a>
<span class="sourceLineNo">019</span> * @param &lt;V&gt; the type of the property<a name="line.19"></a>
<span class="sourceLineNo">020</span> */<a name="line.20"></a>
<span class="sourceLineNo">021</span>@SuppressWarnings({ "serial", "deprecation" })<a name="line.21"></a>
<span class="sourceLineNo">022</span>public abstract class ReadOnlyProperty&lt;V&gt; implements<a name="line.22"></a>
<span class="sourceLineNo">023</span>  Property&lt;V&gt;, Property.ValueChangeNotifier, Property.ReadOnlyStatusChangeNotifier {<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    private Object listeners;                   // space efficient listener hackery<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>    /**<a name="line.27"></a>
<span class="sourceLineNo">028</span>     * Change this instance's value.<a name="line.28"></a>
<span class="sourceLineNo">029</span>     *<a name="line.29"></a>
<span class="sourceLineNo">030</span>     * &lt;p&gt;<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * The implementation in {@link ReadOnlyProperty} always throws {@link com.vaadin.data.Property.ReadOnlyException}.<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * &lt;/p&gt;<a name="line.32"></a>
<span class="sourceLineNo">033</span>     */<a name="line.33"></a>
<span class="sourceLineNo">034</span>    @Override<a name="line.34"></a>
<span class="sourceLineNo">035</span>    public void setValue(V value) {<a name="line.35"></a>
<span class="sourceLineNo">036</span>        throw new Property.ReadOnlyException();<a name="line.36"></a>
<span class="sourceLineNo">037</span>    }<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>    /**<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * Determine if this instance is read-only.<a name="line.40"></a>
<span class="sourceLineNo">041</span>     *<a name="line.41"></a>
<span class="sourceLineNo">042</span>     * &lt;p&gt;<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * The implementation in {@link ReadOnlyProperty} always returns true.<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * &lt;/p&gt;<a name="line.44"></a>
<span class="sourceLineNo">045</span>     */<a name="line.45"></a>
<span class="sourceLineNo">046</span>    @Override<a name="line.46"></a>
<span class="sourceLineNo">047</span>    public boolean isReadOnly() {<a name="line.47"></a>
<span class="sourceLineNo">048</span>        return true;<a name="line.48"></a>
<span class="sourceLineNo">049</span>    }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>    /**<a name="line.51"></a>
<span class="sourceLineNo">052</span>     * Change this instance's read-only setting.<a name="line.52"></a>
<span class="sourceLineNo">053</span>     *<a name="line.53"></a>
<span class="sourceLineNo">054</span>     * &lt;p&gt;<a name="line.54"></a>
<span class="sourceLineNo">055</span>     * The implementation in {@link ReadOnlyProperty} throws {@link UnsupportedOperationException}<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * if {@code readOnly} is false.<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * &lt;/p&gt;<a name="line.57"></a>
<span class="sourceLineNo">058</span>     */<a name="line.58"></a>
<span class="sourceLineNo">059</span>    @Override<a name="line.59"></a>
<span class="sourceLineNo">060</span>    public void setReadOnly(boolean readOnly) {<a name="line.60"></a>
<span class="sourceLineNo">061</span>        if (!readOnly)<a name="line.61"></a>
<span class="sourceLineNo">062</span>            throw new UnsupportedOperationException();<a name="line.62"></a>
<span class="sourceLineNo">063</span>    }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    /**<a name="line.65"></a>
<span class="sourceLineNo">066</span>     * Issue a {@link com.vaadin.data.Property.ValueChangeEvent} to all registered<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * {@link com.vaadin.data.Property.ValueChangeListener}s.<a name="line.67"></a>
<span class="sourceLineNo">068</span>     */<a name="line.68"></a>
<span class="sourceLineNo">069</span>    protected void fireValueChange() {<a name="line.69"></a>
<span class="sourceLineNo">070</span>        if (this.listeners == null)<a name="line.70"></a>
<span class="sourceLineNo">071</span>            return;<a name="line.71"></a>
<span class="sourceLineNo">072</span>        final Property.ValueChangeEvent event = new ValueChangeEvent();<a name="line.72"></a>
<span class="sourceLineNo">073</span>        if (this.listeners instanceof Property.ValueChangeListener)<a name="line.73"></a>
<span class="sourceLineNo">074</span>            ((Property.ValueChangeListener)this.listeners).valueChange(event);<a name="line.74"></a>
<span class="sourceLineNo">075</span>        else {<a name="line.75"></a>
<span class="sourceLineNo">076</span>            for (Property.ValueChangeListener listener : (Property.ValueChangeListener[])this.listeners)<a name="line.76"></a>
<span class="sourceLineNo">077</span>                listener.valueChange(event);<a name="line.77"></a>
<span class="sourceLineNo">078</span>        }<a name="line.78"></a>
<span class="sourceLineNo">079</span>    }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>    /**<a name="line.81"></a>
<span class="sourceLineNo">082</span>     * Invoked when the first {@link com.vaadin.data.Property.ValueChangeListener} has been added.<a name="line.82"></a>
<span class="sourceLineNo">083</span>     *<a name="line.83"></a>
<span class="sourceLineNo">084</span>     * &lt;p&gt;<a name="line.84"></a>
<span class="sourceLineNo">085</span>     * The implementation in {@link ReadOnlyProperty} does nothing.<a name="line.85"></a>
<span class="sourceLineNo">086</span>     * &lt;/p&gt;<a name="line.86"></a>
<span class="sourceLineNo">087</span>     */<a name="line.87"></a>
<span class="sourceLineNo">088</span>    protected void firstListenerAdded() {<a name="line.88"></a>
<span class="sourceLineNo">089</span>    }<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span>    /**<a name="line.91"></a>
<span class="sourceLineNo">092</span>     * Invoked when the last {@link com.vaadin.data.Property.ValueChangeListener} has been removed.<a name="line.92"></a>
<span class="sourceLineNo">093</span>     *<a name="line.93"></a>
<span class="sourceLineNo">094</span>     * &lt;p&gt;<a name="line.94"></a>
<span class="sourceLineNo">095</span>     * The implementation in {@link ReadOnlyProperty} does nothing.<a name="line.95"></a>
<span class="sourceLineNo">096</span>     * &lt;/p&gt;<a name="line.96"></a>
<span class="sourceLineNo">097</span>     */<a name="line.97"></a>
<span class="sourceLineNo">098</span>    protected void lastListenerRemoved() {<a name="line.98"></a>
<span class="sourceLineNo">099</span>    }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>// Property.ValueChangeNotifier<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span>    @Override<a name="line.103"></a>
<span class="sourceLineNo">104</span>    public void addValueChangeListener(Property.ValueChangeListener listener) {<a name="line.104"></a>
<span class="sourceLineNo">105</span>        if (listener == null)<a name="line.105"></a>
<span class="sourceLineNo">106</span>            throw new IllegalArgumentException("null listener");<a name="line.106"></a>
<span class="sourceLineNo">107</span>        if (this.listeners == null) {<a name="line.107"></a>
<span class="sourceLineNo">108</span>            this.listeners = listener;<a name="line.108"></a>
<span class="sourceLineNo">109</span>            this.firstListenerAdded();<a name="line.109"></a>
<span class="sourceLineNo">110</span>        } else if (this.listeners instanceof Property.ValueChangeListener)<a name="line.110"></a>
<span class="sourceLineNo">111</span>            this.listeners = new Property.ValueChangeListener[] { (Property.ValueChangeListener)this.listeners, listener };<a name="line.111"></a>
<span class="sourceLineNo">112</span>        else {<a name="line.112"></a>
<span class="sourceLineNo">113</span>            final Property.ValueChangeListener[] oldArray = (Property.ValueChangeListener[])this.listeners;<a name="line.113"></a>
<span class="sourceLineNo">114</span>            final Property.ValueChangeListener[] newArray = new Property.ValueChangeListener[oldArray.length + 1];<a name="line.114"></a>
<span class="sourceLineNo">115</span>            System.arraycopy(oldArray, 0, newArray, 0, oldArray.length);<a name="line.115"></a>
<span class="sourceLineNo">116</span>            newArray[oldArray.length] = listener;<a name="line.116"></a>
<span class="sourceLineNo">117</span>            this.listeners = newArray;<a name="line.117"></a>
<span class="sourceLineNo">118</span>        }<a name="line.118"></a>
<span class="sourceLineNo">119</span>    }<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>
<span class="sourceLineNo">121</span>    @Override<a name="line.121"></a>
<span class="sourceLineNo">122</span>    public void removeValueChangeListener(Property.ValueChangeListener listener) {<a name="line.122"></a>
<span class="sourceLineNo">123</span>        if (listener == null || this.listeners == null)<a name="line.123"></a>
<span class="sourceLineNo">124</span>            return;<a name="line.124"></a>
<span class="sourceLineNo">125</span>        if (this.listeners instanceof Property.ValueChangeListener) {<a name="line.125"></a>
<span class="sourceLineNo">126</span>            if (!this.listeners.equals(listener))<a name="line.126"></a>
<span class="sourceLineNo">127</span>                return;<a name="line.127"></a>
<span class="sourceLineNo">128</span>            this.listeners = null;<a name="line.128"></a>
<span class="sourceLineNo">129</span>            this.lastListenerRemoved();<a name="line.129"></a>
<span class="sourceLineNo">130</span>            return;<a name="line.130"></a>
<span class="sourceLineNo">131</span>        }<a name="line.131"></a>
<span class="sourceLineNo">132</span>        final Property.ValueChangeListener[] oldArray = (Property.ValueChangeListener[])this.listeners;<a name="line.132"></a>
<span class="sourceLineNo">133</span>        int index = -1;<a name="line.133"></a>
<span class="sourceLineNo">134</span>        for (int i = 0; i &lt; oldArray.length; i++) {<a name="line.134"></a>
<span class="sourceLineNo">135</span>            if (oldArray[i].equals(listener)) {<a name="line.135"></a>
<span class="sourceLineNo">136</span>                index = i;<a name="line.136"></a>
<span class="sourceLineNo">137</span>                break;<a name="line.137"></a>
<span class="sourceLineNo">138</span>            }<a name="line.138"></a>
<span class="sourceLineNo">139</span>        }<a name="line.139"></a>
<span class="sourceLineNo">140</span>        if (index == -1)<a name="line.140"></a>
<span class="sourceLineNo">141</span>            return;<a name="line.141"></a>
<span class="sourceLineNo">142</span>        switch (oldArray.length) {<a name="line.142"></a>
<span class="sourceLineNo">143</span>        case 0:<a name="line.143"></a>
<span class="sourceLineNo">144</span>        case 1:<a name="line.144"></a>
<span class="sourceLineNo">145</span>            throw new RuntimeException("internal error");<a name="line.145"></a>
<span class="sourceLineNo">146</span>        case 2:<a name="line.146"></a>
<span class="sourceLineNo">147</span>            this.listeners = oldArray[1 - index];<a name="line.147"></a>
<span class="sourceLineNo">148</span>            break;<a name="line.148"></a>
<span class="sourceLineNo">149</span>        default:<a name="line.149"></a>
<span class="sourceLineNo">150</span>            final Property.ValueChangeListener[] newArray = new Property.ValueChangeListener[oldArray.length - 1];<a name="line.150"></a>
<span class="sourceLineNo">151</span>            System.arraycopy(oldArray, 0, newArray, 0, index);<a name="line.151"></a>
<span class="sourceLineNo">152</span>            System.arraycopy(oldArray, index + 1, newArray, index, oldArray.length - index - 1);<a name="line.152"></a>
<span class="sourceLineNo">153</span>            this.listeners = newArray;<a name="line.153"></a>
<span class="sourceLineNo">154</span>            break;<a name="line.154"></a>
<span class="sourceLineNo">155</span>        }<a name="line.155"></a>
<span class="sourceLineNo">156</span>    }<a name="line.156"></a>
<span class="sourceLineNo">157</span><a name="line.157"></a>
<span class="sourceLineNo">158</span>    @Override<a name="line.158"></a>
<span class="sourceLineNo">159</span>    @SuppressWarnings("deprecated")<a name="line.159"></a>
<span class="sourceLineNo">160</span>    public void addListener(Property.ValueChangeListener listener) {<a name="line.160"></a>
<span class="sourceLineNo">161</span>        this.addValueChangeListener(listener);<a name="line.161"></a>
<span class="sourceLineNo">162</span>    }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    @Override<a name="line.164"></a>
<span class="sourceLineNo">165</span>    @SuppressWarnings("deprecated")<a name="line.165"></a>
<span class="sourceLineNo">166</span>    public void removeListener(Property.ValueChangeListener listener) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>        this.removeValueChangeListener(listener);<a name="line.167"></a>
<span class="sourceLineNo">168</span>    }<a name="line.168"></a>
<span class="sourceLineNo">169</span><a name="line.169"></a>
<span class="sourceLineNo">170</span>// Property.ReadOnlyStatusChangeNotifier<a name="line.170"></a>
<span class="sourceLineNo">171</span><a name="line.171"></a>
<span class="sourceLineNo">172</span>    @Override<a name="line.172"></a>
<span class="sourceLineNo">173</span>    public void addReadOnlyStatusChangeListener(Property.ReadOnlyStatusChangeListener listener) {<a name="line.173"></a>
<span class="sourceLineNo">174</span>        // nothing to do - read-only status never changes<a name="line.174"></a>
<span class="sourceLineNo">175</span>    }<a name="line.175"></a>
<span class="sourceLineNo">176</span><a name="line.176"></a>
<span class="sourceLineNo">177</span>    @Override<a name="line.177"></a>
<span class="sourceLineNo">178</span>    public void removeReadOnlyStatusChangeListener(Property.ReadOnlyStatusChangeListener listener) {<a name="line.178"></a>
<span class="sourceLineNo">179</span>        // nothing to do - read-only status never changes<a name="line.179"></a>
<span class="sourceLineNo">180</span>    }<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span>    @Override<a name="line.182"></a>
<span class="sourceLineNo">183</span>    @SuppressWarnings("deprecated")<a name="line.183"></a>
<span class="sourceLineNo">184</span>    public void addListener(Property.ReadOnlyStatusChangeListener listener) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>        this.addReadOnlyStatusChangeListener(listener);<a name="line.185"></a>
<span class="sourceLineNo">186</span>    }<a name="line.186"></a>
<span class="sourceLineNo">187</span><a name="line.187"></a>
<span class="sourceLineNo">188</span>    @Override<a name="line.188"></a>
<span class="sourceLineNo">189</span>    @SuppressWarnings("deprecated")<a name="line.189"></a>
<span class="sourceLineNo">190</span>    public void removeListener(Property.ReadOnlyStatusChangeListener listener) {<a name="line.190"></a>
<span class="sourceLineNo">191</span>        this.removeReadOnlyStatusChangeListener(listener);<a name="line.191"></a>
<span class="sourceLineNo">192</span>    }<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>// ValueChangeEvent<a name="line.194"></a>
<span class="sourceLineNo">195</span><a name="line.195"></a>
<span class="sourceLineNo">196</span>    private class ValueChangeEvent extends EventObject implements Property.ValueChangeEvent {<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span>        ValueChangeEvent() {<a name="line.198"></a>
<span class="sourceLineNo">199</span>            super(ReadOnlyProperty.this);<a name="line.199"></a>
<span class="sourceLineNo">200</span>        }<a name="line.200"></a>
<span class="sourceLineNo">201</span><a name="line.201"></a>
<span class="sourceLineNo">202</span>        @Override<a name="line.202"></a>
<span class="sourceLineNo">203</span>        @SuppressWarnings("rawtypes")<a name="line.203"></a>
<span class="sourceLineNo">204</span>        public Property/*&lt;?&gt;*/ getProperty() {<a name="line.204"></a>
<span class="sourceLineNo">205</span>            return (Property)this.getSource();<a name="line.205"></a>
<span class="sourceLineNo">206</span>        }<a name="line.206"></a>
<span class="sourceLineNo">207</span>    }<a name="line.207"></a>
<span class="sourceLineNo">208</span>}<a name="line.208"></a>
<span class="sourceLineNo">209</span><a name="line.209"></a>




























































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